Aspeed AST2600 EVB

Introduction
============

The AST2600 EVB is an evaluation board for the AST2600 SoC, most
commonly used as a Server Management Processor. It includes a
Dual-core ARM Cortex A7 processor with DDR4 SDRAM (up to 2GB), SPI
flash memory devices for BMC and host firmwares and numerous
controllers to drive the server board.

  https://www.aspeedtech.com/server_ast2600/

How to build it
===============

Configure buildroot:

  $ make aspeed_ast2600evb_defconfig

Compile everything and build the rootfs image:

  $ make

Result of the build
===================

After building, the output/images directory contains:

  output/images/
    ├── aspeed-ast2600-evb.dtb
    ├── flash.img
    ├── image.itb
    ├── rootfs.cpio
    ├── rootfs.cpio.xz
    ├── rootfs.tar
    ├── u-boot.bin
    └── zImage

Flashing the image
==================

To update the contents of the first flash device, copy flash.img :

  $ flashcp flash.img /dev/mtd0

or simply the boot loader:

  $ flashcp u-boot.bin /dev/mtd1

Preparing the board
===================

 * Connect a serial line to the board
 * Power-up the board

Booting the board
=================

The AST2600 EVB boots from the SPI flash device directly and loads a
first bootloader (usually U-Boot). U-Boot will attempt to load a Linux
kernel from the same flash device by default but other storage could
be used.

 * from U-Boot

   The FIT image image.itb can be used to boot the board from U-Boot
   using tftp

 * with QEMU

   $ qemu-system-arm -M ast2600-evb \
	-drive file=output/images/flash.img,format=raw,if=mtd \
	-nographic

   $ qemu-system-arm -M ast2600-evb \
	-kernel output/images/zImage \
	-initrd output/images/rootfs.cpio \
	-dtb output/images/aspeed-ast2600-evb.dtb \
	-nographic